Diabetis and MS, are they linked

Patient : My brother was diagnosed at 7 with type 1 diabetis. He is 45 now, blind in one eye, 40 per cent vision in the other. About 5 years ago he was also ridden with MS.
My youngest son who is 21 was just diagnosed (5 months ago)with type 1 diabetes.
I have recently heard that MS and diabetes are linked. Is this true..???
Thank you ........ Joanne

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